Soil Nails/Rock Bolts

RIX has years of experience stabilising weak soil layers on freshly cut or pre-existing excavation by installing both temporary and permanent soil nails and rock bolts.

Soil nails are typically solid bars or fiberglass bolts that are installed into pre-drilled holes and then cement grouted into place using a separate grout line. A soil nail 100-year design life can be offered by placing the soil nails into plastic HDPE sheathing and encapsulating the bars in grout, both within the sheathing and outside the drilled hole, offering double corrosion protection to the soil nail. Increased bar diameter and galvanisation also offer increased soil nail design life.

Soil nails are installed into a pre-drilled hole that penetrates through the initial loose soil layers into the stable ground beneath and cement grouted into place.

The quality of all aspects of soil nail materials, installation and grouting is paramount to the project’s success.

RIX in-house Management Teams offer advice on design, planning and project execution, offering fully-certified QA systems to ISO9001.

Soil nailing is commonly used in road corridors and in rail cuttings, ensuring the long term integrity of the slope.

Soil nails offer a method of securing excavations, slopes or embankments by installing passive bars through and into the fault line. Soil nailing is particularly useful where limited access or ground conditions may hinder the use of piling techniques or where existing slopes, embankments or retaining walls show signs of failure.

A rock bolt is a long anchor bolt for stabilizing rock excavations, which may be used in tunnels or rock cuts. It transfers load from the unstable exterior to the confined (and much stronger) interior of the rock mass.

Rock bolts were first used in mining in the 1890s. Rock bolts were applied to civil tunnelling support in the US and in Australia, starting in the late 1940s. Rock bolts were used and further developed, starting in 1947, by Australian engineers who began experimenting with 4m-long expanding anchor rock bolts while working on the Snowy Mountains Scheme.

Rock bolts are almost always installed in a pattern, the design of which depends on the rock quality designation and the type of excavation.There are many types rock bolts, including:

  • Mechanical bolts
  • Epoxy bolts
  • Cement grouted bolts
  • Fiberglass bolts